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Compared to a half-billion year ago, sea creatures are, on average, roughly 150 times bigger, a new study finds.
Scientists had long known birds descended from dinosaurs. A study now shows that the morphing from dinos into birds went along with a quick and steady shrinking of their body sizes.
This late-Jurassic dino was also a bird. Its ample coat of feathers emerged before any need for flight.
When temperatures rise, New Zealand’s tuatara produce more males. With global warming, that could leave the ancient reptile species with too few females to avoid going extinct.
Scientists observe some evolutionary speed demons as they adapt over the course of just a few years to new environmental conditions.